Only just got around to checking Angielczyk's link, and sure enough it's there. The particular lettering around the star is a mystic/occult magic symbol derived from Kabbalistic traditions, called the "second pentacle of Mars". Googling that exact phrase will come up with dozens of trinket-sellers who will sell you one, usually for an exorbitant price, mostly made of "lead-free pewter" though most of the ones on offer appear to be mass-produced copies-of-copies-of-copies with little or none of the original detail surviving.
I have no idea if the wiccans have "borrowed" this symbol and given their own meaning to it, so I don't know if the medals pictured here and elsewhere on the forum are actually occultic or if they date from earlier Jewish/Kaballistic issuers. None of the sellers bothered to depict the other side, so I don't know what the reverses of their amulets look like, but all of those have mounts at their tops for attaching to a chain.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis